Transmission and Differential fluid change

[Batlwagn]

1) Take your Allen key
2) Cut it

Thanks, I was heading that direction just didn't know if there was another answer

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[esoulliard]

For those of you who replaced the gear oil in you diff, do you get any more noise from it now? I notice some clunks from the rear when the car is cold. I don't notice it at all after it warms up.

 

[razorlab]

Hey all, this is a bump from hell. Just got under the car to do the trans service I don't see a way to access the fill plug. I tried using a Allen socket which was too long and a regular L shaped Allen wrench is also too long to fit between the chassis and the side of the trans. Help!

stubby like these https://www.amazon.com/CTA-Tools-5057-Stubby-Metric/dp/B082M1L6S7/

 

[Batlwagn]

stubby like these https://www.amazon.com/CTA-Tools-5057-Stubby-Metric/dp/B082M1L6S7/

Thanks man, I actually ended having an old Allen wrench that happened to be the corrected size. So I buzzed it down and now it's my dedicated trans plug wrench

 

[MAXecutive]

For those of you who replaced the gear oil in you diff, do you get any more noise from it now? I notice some clunks from the rear when the car is cold. I don't notice it at all after it warms up.

Yes! I went with Redline and notice that when the car is cold. Anytime you turn the front wheels and start to move you will feel the diff activate and it feels harsh. Once the oil is up to temp its fine. I did redline because I actually overheated the diff during a track session. I'm switching back to OEM and will just change the oil more frequently.

 

[esoulliard]

Yes! I went with Redline and notice that when the car is cold. Anytime you turn the front wheels and start to move you will feel the diff activate and it feels harsh. Once the oil is up to temp its fine. I did redline because I actually overheated the diff during a track session. I'm switching back to OEM and will just change the oil more frequently.

Thanks for the reply. I was in the same boat, but I haven't gotten any overheating on track since replacing the fluid. I guess that goes with the territory of compromises for the track: squeaky brakes, noisy diff, chipped up windshield...

 

[Silverbmpra]

Hey all, this is a bump from hell. Just got under the car to do the trans service I don't see a way to access the fill plug. I tried using a Allen socket which was too long and a regular L shaped Allen wrench is also too long to fit between the chassis and the side of the trans. Help!

I am going to try this bad boy this weekend and see if he fits/works...

 

[zrk]

Take an allen wrench, and cut it.

 

[94boosted]

If anyone was wondering, here's the BMW part number for the factory fill on the differential.

Hypoid Axle Oil G4

83 22 2 447 362

3 x 500 ml

Is this p/n now discontinued? Does anyone know if there is an updated p/n?

If not has anyone tried the Liqui Moly product? High Performance Gear Oil (GL4+) SAE 75W-90 | LIQUI MOLY (liqui-moly.com)

 

[concept]

Is this p/n now discontinued? Does anyone know if there is an updated p/n?

I just bought a bottle, last month. Sadly, I had to get it at a Toyota dealership. All the BMW dealerships had bulk oil, only.

 

[94boosted]

I just bought a bottle, last month. Sadly, I had to get it at a Toyota dealership. All the BMW dealerships had bulk oil, only.

What did that set you back? I'm tempted to just run Liqui Molly or Redline.

 

[concept]

What did that set you back? I'm tempted to just run Liqui Molly or Redline.

$82 after tax. I'm glad I needed only one. Do those fluids meet the same specs as the BMW stuff?

 

[razorlab]

Motul Gear 300 75w90 or Liqui moly you linked. Don’t pay $80 for oem, that’s insanity. Especially since it actually costs $45.

@concept got taken for a ride.

 

[94boosted]

Motul Gear 300 75w90 or Liqui moly you linked. Don’t pay $80 for oem, that’s insanity. Especially since it actually costs $45.

@concept got taken for a ride.

Our cars supposedly need G4 Diff Fluid, the Motul stuff you linked is GL-4, is that the same?

 

[razorlab]

Our cars supposedly need G4 Diff Fluid, the Motul stuff you linked is GL-4, is that the same?

Motul meets both: https://azupim01.motul.com/media/motulData/DO/base/GEAR_300_75W-90_en_DE_motul_34200_20221014.pdf

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